A relationship is likely to last way longer, if each partner convinces or has convinced themselves that they do not deserve their partner, even if that is not true.
Casting a curious gaze down on planet Earth, extra-terrestrial beings could well be forgiven for assuming that we humans are programmed in every move we make, by a palm-sized, oblong, slab of glass. More perplexing than that, who on earth could convince them otherwise ?
My usual instruction to students when they are preparing to write their examinations is "think before you answer the questions". I am convinced that some multiple choice answers could be so close that you might not know the very one that answers the question correctly! Such is life. To choose your suitable dreams, you must think well!
When I find that stubbornness continually overrides common sense regardless of the logic of my argument, it seems that the only effective solution is to tell them to go ahead and stick their finger in the socket. And what I find is that what my argument failed to solve, electricity does quite nicely.